During the night LHC ramped the energy of both beams to 1.18 TeV and achieved collisions at 2.36 TeV with "quiet beams". ALICE recorded some thousands of collision events. Here you see sequences of events with ITS tracks from the two runs (105054, left and 105057, right) recorded during the night.
Out of the many thousands of collisions at 900 GeV recorded during the week, here is the heaviest dimuon event recorded so far (m~1.85 GeV/c2).
Two more event displays from run 104070 (pp collisions at 900 GeV).
The first muons seen by the ALICE muon spectrometer in pp collisions. Left : reconstruction of event 732 in run 104058 (PHYSICS_4 partition, muon trigger and tracking only). The track has pT = 0.9 GeV/c and p = 14.8 GeV/c. Right: the reconstruction of event 618 in run 104070 (PHYSICS_1 partition, with all ALICE detectors). The track has pT = 0.4 GeV/c and p = 7.2 GeV/c. Both tracks have hits in both the trigger and tracking chambers.
22:37 Stable beams, 4 bunches on 4.
07:00 Stable beams, 4 bunches on 4.
06:00 will continue tomorrow..in the meantime, here is a collision event with ITS tracks .
01:37 4 bunches circulating in each beam
23:30 Two beams circulating (single bunches)
16:30 More than 60 persons in the ACR ready to record 900 GeV collisions, foreseen at 20:00. Both ALICE magnets are on (solenoid at 30 kA, dipole at 5.85 kA).
First ALICE paper with LHC data
accepted by EPJC for publication
LHC restart - Sunday 22 November 2009
20:00 When we get some interesting events we will be back - watch this space
14:00 LHC getting ready to inject beam